Rock-drilling machine.



PATENTBD 00T. 4, v1904.

o. GILLIERQN. ROCK DRILLING MACHINE.

APPLICATION FILED JAN. 27. 1903.

'Nol MODEL.

lli.

UNITED STATES Patented October 4, 1904r PATENT OFFICE.

ROCK-DRILLING MACHINE.

SPECIFICATION forming part of Letters Patent N o. 771,625, dated October 4, 1904.

I Application led January 27, 1903. Serial No. 140,743. (No model.)

To MLU/'hom t may concern.-

Beit known that I, CHARLES GILLIRON, engineer, a citizen of the Republic of Switzerland, and a resident of Vige, Switzerland, have invented certain new and useful Improvements in and Relating to Rock-Drilling Machines, of which the following' is a specification.

The rock-drilling machines known up to now have the disadvantage that when suddenly meeting a harder portion of rocks the drill-advancing mechanism of the said machines is stopped automatically, the drill then working idle and being rapidly worn out. Some of them have a spring-controlled advancing device by means of which the drill is pressed forward with a yielding pressure. With such machines, however, if the rock becomes very hard the advancing device becomes ineffective and the drill polishes itself against the rock. Such machines have, further, an advancescrew rotating with the drill and pressed forward with the drill, suoli screw being thus submitted to a great pressure, causing a rapid wear of the same as well as a great loss of motive power. In the present invention are these disadvantages removed by inserting a spring between an independently-hand-controlled advance-screw and the rotating drill. The pressure of the drill against the rock can thus at will be increased or reduced during the drilling, and particularly if the drill is meeting hard rock the pressure can be increased without causing the advance device to become ineffective, so as to avoid the idle running and the polishing of the drill. The advance-screw being' further not rotative with the drill, the machine runs with little wear and good eficiency with regard to the motive power employed. v

The annexed drawings show a rock-drill machine constructed according to my invention. Figure l is a lateral view, partly in section, and Fig. 2 a plan view, of those-portions of the drilling-machine 'which are. necessary for the understanding of the invention. Fig. 3 is a sectional view on line A B, Fig. 1. Fig. 4 is a sectional view on line C D, Fig. l.

The shaft bearing the drill a, is arranged 4screws CZ, which engage in a longitudinal groove of the said shaft b. Sleeve c is located in a socket or casing e2, in which two annular bearings f are secured by screws, by means of which the friction between sleeve and socket is reduced. The backward longitudinal movement of sleeve c within the socket or casing e2 is prevented by an annular collar 02 of sleeve c, which rests on the forward annular bearing f, and the forward longitudinal movement of sleeve c is prevented by gearwheel o abutting against the rear end of casing e2. The socket or casing @2 is carried by a frame e of any suitable construction whatever, and the said frame e is pivotally connected to a framework e'. (Shown in dotted lines.)

y The moving ahead or backward of the drill is effected by hand by means of a screw n, which is acted upon by a hand wheel n. Screw n is screwed in the nut 0, which is in turn fixed on two arms o of the frame e. The free end of said screw is guided by slidingly engaging the sleeve p with eveninner surface, the exterior of which is provided with screwthreads. Said sleeve p is screwed on the frame e in such a manner that it is exactly in line with the sleeve c. The one end of shaft b is also slidingly engaged in the sleeve p, and between the front end of screw n and the back end of shaft b there is inserted a spiral spring r, which is pressing against suitable steel Washers in order to reduce the friction between shaft b and the said spring r, such steel washers being intercalated on the one hand between the extremities of screw n and the spiral spring and on the other hand between the latter and the end of the drill-shaft L. With a view of allowing the'said screw n to be able to retract the shaft 7) the latter is provided at its rear extremity with a c vlindrical cavity bx, the end of which is provided with a cover u and in which plays a piston 5 nx, the rod of which is screwed in the eX- tremity of the said screw n., this device being' intended to allow the shaftbto be retracted by means of screw n whenever screw n is being rotated backward. Thepiston or headed rod WX in connection with the spring v' comprises a yielding coupling device or coupler by which the lengthwise movements of the screw are transmitted to the shaft, while the rotary motion ofthe shaft is not permitted to affect the screw. To allow achangement of inclination of shaft and drill, the frame e is connected, by means of two pivots @X and of a setting-screw z5, to the framework c of the machine.

Cooling of the drill takes place in the usual manner by injecting cold waterin the interior of a hollow ring e, which is idle on the intermediate piece fux.

The working of the machine is as follows: The shaft f/ is rotated by means of any motive power whatever, which causes the rotation of the sleeve c, and bymeans of the studs (Z of the shaft and of the drill. The operator turns then the hand-wheel a so as to press the drill against the rock with the desired pressure and maintains it pressed during all the time of the drilling by turning gradually the hand-wheel n. If hard rock portions are suddenly met, the pressure is increased by turning more rapidly the wheel n' and the working idle of the drill is thus avoided. Guiding-sleeve p is gradually advanced by hand with the forward movement of the drill in order to always correctly guide the eX- tremities of shaft 7) and screw n. 1f sleeve p is long enough, there is of course no necessity of moving it and of providing its outer surface with screw-threads.

Having thus fully described my invention, I claim l. An improved rock-drilling machine comprising the combination of a rotative shaft for carrying the drill; an independently-controlled advance-screw; and a spring-controlled coupling device connected with the opposing eX- tremities of said shaft and said advance-screw, said coupling device transmitting to said shaft the longitudinal movements of said screw. in

W. /both directions.

6.5 device; a screw for giving said device lengthwise movement; and a spring-controlled coupler for connecting said device and said screw and transmitting the longitudinal movements of said screw to said device in both directions.

4C. The combination in a rock-drilling machine of a drilling-tool; al device for holding said tool; a screw for giving said'device lengthwise movement; aspring-controlled coupler which is connected with said device and screwl and transmits the lengthwise movements of said screw to saiddevice in both directions; and a sleeve for inclosing said coupler.

5. The combination in a rock-drilling machine of a drilling-tool; a holding device for said tool; mechanism for giving said holding device lengthwise movement; yielding connecting means interposed between said device and mechanism; and an adjustable sleeve for inclosing said connecting means.

6. The combination in a rock-drilling machine of a drill holder; said holder being formed with a recess in one end; a device for giving said holder lengthwise movement; and a piston one end of which is connected to said device and the other end of which works in said recess.

7. The combination in a rock-drilling machine of a drill-holder; said holder being formed with a recess in one end; mechanism for giving said holder lengthwise movement; a yielding device between said holder and mechanism; a piston one end of which is connected to said mechanism and the other end of which works in said recess; means for inclosing said yielding device; andmeans for giving said holder rotation.

8. A rock-drilling machine comprising the combination of a support; a casing rotatably mounted in said support; adrill-holder mounted in said casing'; means for rotating said drillholder; a screw for reciprocating' said drillholder; and a spring-controlled coupling connected with the ends of said drill-holder and screw, and thereby adapted to transmit lengthwise motion of said screw in both directions to said holder.

9. In combination in a rock-drilling machine, a rotatable shaft for holding the drill; a screw for reciprocating said shaft; and a yielding coupling device connected to the opposing ends of said shaft and said screw, said coupling device transmitting' the lengthwise movements of said screw in both directions without said screws being affected by the rotary motion of said shaft.

10. In combination in a rock-drilling machine, a rotatable shaft for 4holding the drill; a screw for reciprocating said shaft; a yielding member interposed between the opposing ends of saidshaft and said screw; and a device for so coupling said ends as to transmit the lengthwise movement of said screw in both directions to said shaft without transmitting the rotary motion of said shaft to said screw.

11. yIn combination in a rock-drilling' ma- IOO IIO

chine, a rotatable drill-holder; a device for moving said drill-holder lengthwise in both directions; a yielding member interposed lbe tween the opposing ends of said device and said drill-holder and adapted t0 store energy by the forward movement of said device; and

a coupler for so connecting said ends as to transmit the lengthwise'movementin both di` rections of said device to said shaft Without ltransmitting the rotary motion of said shaft IO 

